User Manual

The TWAIN Interface 25
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Master channel is the only active channel for gray images.
2.2.2.9
Threshold
This setting is available only when
Black & White
is selected as
Scan Mode
.
Threshold sets the color level for converting an image to line art, which can adjust
the quality of line art image or eliminate unwanted dots in the documents to
improve OCR accuracy.
The following options are available from the drop-down list:
·
Basic
You may adjust the
Threshold value
either way:
·
Slide the thumb of
the scroll bar to the right or left
to decrease or increase
the Threshold value
.
·
Click the arrow signs on the right and left ends.
The current value is shown to right of the scroll bar.
·
Advanced
You may adjust the
Radius / Weight
value
either way: